1/6/2024 0 Comments Type to learn 3 clientBy default, the most frequently used types in the class library are available in any C# program. NET class library itself is a collection of custom types that you can use in your own applications. You use the struct, class, interface, enum, and record constructs to create your own custom types. For the complete list of the built-in types, see Built-in types. These types are available for you to use in any C# program. There are also built-in string and object types. These represent integers, floating point values, Boolean expressions, text characters, decimal values, and other types of data. Built-in typesĬ# provides a standard set of built-in types. A conversion that might cause data loss requires a cast in the source code.įor more information, see Casting and Type Conversions. A type conversion that doesn't cause data loss is performed automatically by the compiler. However, values can be converted to other types, for example when they're assigned to new variables or passed as method arguments. For example, you can't declare an int and then assign it a Boolean value of true. Private string names = Īfter you declare a variable, you can't redeclare it with a new type, and you can't assign a value not compatible with its declared type. The following signature shows a method that requires an int as an input argument and returns a string: public string GetName(int ID) The types of method parameters and return values are specified in the method declaration. Declaration with initializers (four examples): The following example shows some variable declarations that use both built-in numeric types and complex user-defined types: // Declaration only: When you declare a variable or constant in a program, you must either specify its type or use the var keyword to let the compiler infer the type. Specifying types in variable declarations The common language runtime (CLR) uses that metadata at run time to further guarantee type safety when it allocates and reclaims memory. The compiler embeds the type information into the executable file as metadata. Operator '+' cannot be applied to operands of type 'int' and 'bool'.Ĭ and C++ developers, notice that in C#, bool is not convertible to int. If you try to perform those same operations on a variable of type bool, the compiler generates an error, as shown in the following example: int a = 5 For example, if you declare a variable of type int, the compiler allows you to use the variable in addition and subtraction operations. The compiler uses type information to make sure all operations that are performed in your code are type safe. The kinds of operations that are permitted.The members (methods, fields, events, and so on) that it contains.The maximum and minimum values that it can represent.The storage space that a variable of the type requires.The information stored in a type can include the following items: A typical C# program uses types from the class library and user-defined types that model the concepts that are specific to the program's problem domain. These include the file system, network connections, collections and arrays of objects, and dates. NET class library defines built-in numeric types and complex types that represent a wide variety of constructs. Every method declaration specifies a name, the type and kind (value, reference, or output) for each input parameter and for the return value. Every variable and constant has a type, as does every expression that evaluates to a value.
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